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diff --git a/chrome/browser/cocoa/popup_blocked_animation_mac.mm b/chrome/browser/cocoa/popup_blocked_animation_mac.mm
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+++ b/chrome/browser/cocoa/popup_blocked_animation_mac.mm
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+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/popup_blocked_animation.h"
+
+#import <Cocoa/Cocoa.h>
+#import <QuartzCore/QuartzCore.h>
+
+#import "base/nsimage_cache_mac.h"
+#import "chrome/browser/cocoa/animatable_image.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/common/notification_registrar.h"
+#include "chrome/common/notification_service.h"
+
+class PopupBlockedAnimationObserver;
+
+// A class for managing the Core Animation popup blocked animation.
+@interface PopupBlockedAnimationMac : NSObject {
+ @private
+  // The observer for the TabContents we are drawing on.
+  scoped_ptr<PopupBlockedAnimationObserver> observer_;
+  AnimatableImage* animation_;
+};
+
+// Called by our the Observer if the tab is hidden or closed.
+- (void)animationComplete;
+
+@end
+
+// A helper class to monitor tab hidden and closed notifications. If we receive
+// such a notification, we stop the animation.
+class PopupBlockedAnimationObserver : public NotificationObserver {
+ public:
+  PopupBlockedAnimationObserver(PopupBlockedAnimationMac* owner,
+                                TabContents* tab_contents)
+      : owner_(owner),
+        tab_contents_(tab_contents) {
+    registrar_.Add(this,
+                   NotificationType::TAB_CONTENTS_HIDDEN,
+                   Source<TabContents>(tab_contents_));
+    registrar_.Add(this,
+                   NotificationType::TAB_CONTENTS_DESTROYED,
+                   Source<TabContents>(tab_contents_));
+  }
+
+  // Runs when a tab is hidden or destroyed. Let our owner know we should end
+  // the animation.
+  void Observe(NotificationType type,
+               const NotificationSource& source,
+               const NotificationDetails& details) {
+    // This ends up deleting us.
+    [owner_ animationComplete];
+  }
+
+ private:
+  // The object we need to inform when we get a notification. Weak.
+  PopupBlockedAnimationMac* owner_;
+
+  // The tab we are observing. Weak.
+  TabContents* tab_contents_;
+
+  // Used for registering to receive notifications and automatic clean up.
+  NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(PopupBlockedAnimationObserver);
+};
+
+@implementation PopupBlockedAnimationMac
+
+- (id)initWithTabContents:(TabContents*)tabContents {
+  if ((self = [super init])) {
+    NSImage* image = nsimage_cache::ImageNamed(@"popup_window_animation.pdf");
+    CGFloat imageWidth = [image size].width;
+    CGFloat imageHeight = [image size].height;
+
+    NSView* tabContentsView = tabContents->GetNativeView();
+    NSWindow* parentWindow = [tabContentsView window];
+    if (!parentWindow) {
+      // The tab is no longer frontmost.
+      [self release];
+      return nil;
+    }
+
+    NSRect windowFrame = [parentWindow frame];
+
+    // Sanity check the size in case there's no room to display the animation.
+    if (imageWidth >= NSWidth(windowFrame) ||
+        imageHeight >= NSHeight(windowFrame)) {
+      [self release];
+      return nil;
+    }
+
+    // Create the animation window to be the top-right quadrant of the window.
+    // The animation travels from the center of the window to the blocked
+    // content section of the Omnibox. This will release itself.
+    NSRect animationFrame = windowFrame;
+    CGFloat dX = NSWidth(animationFrame) / 2 - imageWidth / 2;
+    CGFloat dY = NSHeight(animationFrame) / 2 - imageHeight / 2;
+    animationFrame.origin.x += dX;
+    animationFrame.origin.y += dY;
+    animationFrame.size.width -= dX;
+    animationFrame.size.height -= dY;
+    animation_ = [[AnimatableImage alloc] initWithImage:image
+                                         animationFrame:animationFrame];
+    [parentWindow addChildWindow:animation_ ordered:NSWindowAbove];
+
+    // Start the animation from the center of the window.
+    NSRect contentFrame = [[animation_ contentView] frame];
+    [animation_ setStartFrame:CGRectMake(0,
+                                         imageHeight / 2,
+                                         imageWidth,
+                                         imageHeight)];
+
+    // Set the end frame to be small (a la the actual blocked icon) and inset
+    // slightly to the Omnibox. While the geometry won't align perfectly, it's
+    // close enough for the user to take note of the new icon. These numbers
+    // come from measuring the Omnibox without any page actions.
+    [animation_ setEndFrame:CGRectMake(animationFrame.size.width - 115,
+                                       animationFrame.size.height - 50,
+                                       16, 16)];
+    [animation_ setStartOpacity:1.0];
+    [animation_ setEndOpacity:0.2];
+    [animation_ setDuration:0.7];
+
+    observer_.reset(new PopupBlockedAnimationObserver(self, tabContents));
+
+    // When the window is about to close, release this object and remove the
+    // animation from the parent window.
+    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
+    [center addObserver:self
+               selector:@selector(windowWillClose:)
+                   name:NSWindowWillCloseNotification
+                 object:animation_];
+    [animation_ startAnimation];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  [super dealloc];
+}
+
+- (void)windowWillClose:(NSNotification*)notification {
+  DCHECK([[notification object] isEqual:animation_]);
+  [self animationComplete];
+}
+
+- (void)animationComplete {
+  [[animation_ parentWindow] removeChildWindow:animation_];
+  [self release];
+}
+
+@end
+
+void PopupBlockedAnimation::Show(TabContents* tab_contents) {
+  // The object will clean up itself at the end of the animation.
+  [[PopupBlockedAnimationMac alloc] initWithTabContents:tab_contents];
+}